Improve Download and verify (DAVE) - JS possible dependancy

Originally created by @tchou on #10634 (Redmine)

- Fix download in Firefox on Windows (0 MiB)

- ~~Fix browser detection in Chrome~~
- ~~Fix “You are using Firefox 1”~~

Feature Branch: web/10634-DAVE-JS

Edited May 15, 2020 by tchou

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information